From mlarsson@demon.co.uk Tue Dec 19 14:20:47 1995
Path: ashpoly!cascade!bigsur!demon!mlarsson
From: mlarsson@demon.co.uk (Min-jun Larsson)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Dec19.142047.9705@demon.co.uk>
Date: Tue, 19 Dec 1995 14:20:47 GMT
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Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz.

A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier.
At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs.

What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT?

-- 
Min-jun Larsson
Tape trading list upon request. SASE required for international mail.

From vkim@purdue.edu Tue Dec 19 22:10:47 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!vkim
From: vkim@purdue.edu (Valeria Kim)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1995Dec19.221047.9519@purdue.edu>
Date: Tue, 19 Dec 1995 22:10:47 GMT
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In article <1995Dec19.142047.9705@demon.co.uk>, mlarsson@demon.co.uk (Min-jun Larsson) writes:
> Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz.

Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform.

If you are posting from AOL, please read RFC 1036 before posting again.

-- 
Valeria Kim | vkim@purdue.edu
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"Keep the channels open."